Write out pre-heat button enabled condition
Write out pre-heat button enabled condition

It should be equivalent. This needs to be done because the line is getting long and I need to add additional checks for if the properties are even set.

Contributes to issue CURA-3161.

fieldOfView/Cura,fieldOfView/Cura,hmflash/Cura,Curahelper/Cura,ynotstartups/Wanhao,ynotstartups/Wanhao,Curahelper/Cura,hmflash/Cura